... Im not expert by no means, but just by what I have been reading up on..The scar tissue could be from anything more or less an old infection perhaps..
Not all fibrosis is fatal... Take Care (1 replies)

... ay performed as a yearly requirement for employment. His results were mailed to him stating"No active pulmonary disease. Heart is not enlarged. There is fibrosis in the left perihilar region extending into the left upper lobe. ... (1 replies)